McDonnell & Miller 150S/157S Low Water Cut Off/Pump

For low pressure steam boilers with cold water feed
Eliminates necessity to manually add water to the boiler
Can be used with mechanical or electronic low water cut-off controls
Quick-change replaceable cartridge valve and strainer
Manual feed button
Model 101-A features a 120 VAC solenoid
Model 101-A-24 features a 24 VAC solenoid and a separate 50VA transformer
Maximum water supply pressure 150 psi (10.5 kg/cm2)
Maximum boiler pressure 25 psi (1.8 kg/cm2)
Maximum inlet water temperature 120°F (49°C)
Maximum power consumption
– 40 VA at 24 VAC
– 40 VA at 120 VAC

If you need a different model other than those listed, please contact us at

SKU: MCDM016 Category: Tag:


McDonnell & Miller 150S/157S Low Water Cut Off/Pump

Cut-off and alarm actuation
Optional features
Manual reset
2 Single pole, single throw switches
2 Single pole, double throw switches
Float block
BSPT threads
Maximum pressure 150 psi (10.5 kg/cm2)
For new electronic 150E Series see Model 150S-MD
Maximum differential operation – Prevents nuisance burner shutdowns in low pressure applications
Maximum operating pressure 50 psi (3.5 kg/cm2)


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